<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>
<script>
  var CheckObject = function(){};
  CheckObject.prototype = {
    checkName : function(){
      // 验证姓名
      console.log('name checked');
      return this;
    },
    checkEmail : function(){
      // 验证邮箱
      console.log('email checked');
      return this;
    },
    checkPassword : function(){
      // 验证密码
      console.log('password checked');
      return this;
    }
  }
  var a = new CheckObject();
  a.checkName().checkEmail().checkPassword();
</script>
</body>
</html>